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 [算法]简单加密/解密方法包装
软件技术, 电脑与网络
lhwork 发表于 2006/6/21 14:00:46 |
| package steeven;/*用途: 简单加密/解密方法包装作者: steeven@kali.com.cn日期: 12/05/2001感谢: http://www-900.ibm.com/developerWorks/java/l-security/index.shtml说明:This Class need JCE, download here:http://java.sun.com/security/index.html*/import java.security.*;import javax.crypto.*;public class Crypt { private static String Algorithm="DES"; //定义 加密算法,可用 DES,DESede,Blowfish static boolean debug = false; static{ Security.addProvider(new com.sun.crypto.provider.SunJCE()); } //生成密钥, 注意此步骤时间比较长 public static byte[] getKey() throws Exception{ KeyGenerator keygen = KeyGenerator.getInstance(Algorithm); SecretKey deskey = keygen.generateKey(); if (debug) System.out.println("生成密钥:"+byte2hex(deskey.getEncoded())); return deskey.getEncoded(); } //加密 public static byte[] encode(byte[] input,byte[] key) throws Exception{ SecretKey deskey = new javax.crypto.spec.SecretKeySpec(key,Algorithm); if (debug){ System.out.println("加密前的二进串:"+byte2hex(input)); System.out.println("加密前的字符串:"+new String(input)); } Cipher c1 = Cipher.getInstance(Algorithm); c1.init(Cipher.ENCRYPT_MODE,deskey); byte[] cipherByte=c1.doFinal(input); if (debug) System.out.println("加密后的二进串:"+byte2hex(cipherByte)); return cipherByte; } //解密 public static byte[] decode(byte[] input,byte[] key) throws Exception{ SecretKey deskey = new javax.crypto.spec.SecretKeySpec(key,Algorithm); if (debug) System.out.println("解密前的信息:"+byte2hex(input)); Cipher c1 = Cipher.getInstance(Algorithm); c1.init(Cipher.DECRYPT_MODE,deskey); byte[] clearByte=c1.doFinal(input); if (debug){ System.out.println("解密后的二进串:"+byte2hex(clearByte)); System.out.println("解密后的字符串:"+(new String(clearByte))); } return clearByte; } //md5()信息摘要, 不可逆 public static byte[] md5(byte[] input) throws Exception{ java.security.MessageDigest alg=java.security.MessageDigest.getInstance("MD5"); //or "SHA-1" if (debug){ System.out.println("摘要前的二进串:"+byte2hex(input)); System.out.println("摘要前的字符串:"+new String(input)); } alg.update(input); byte[] digest = alg.digest(); if (debug) System.out.println("摘要后的二进串:"+byte2hex(digest)); return digest; } //字节码转换成16进制字符串 public static String byte2hex(byte[] b) { String hs=""; String stmp=""; for (int n=0;n<b.length;n++){ stmp=(java.lang.Integer.toHexString(b[n] & 0XFF)); if (stmp.length()==1) hs=hs+"0"+stmp; else hs=hs+stmp; if (n<b.length-1) hs=hs+":"; } return hs.toUpperCase(); } public static void main(String[] args) throws Exception{ debug = true;// byte[] key = getKey(); byte[] key = "好好学习".getBytes(); decode(encode("测试加密".getBytes(),key),key); md5("测试加密".getBytes()); }} |
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